Cylinder-cock.



I No. 878,686.

PATENTED FEB. 11, 1908.

'A.SUNDBO'RG.

, GYLINDBR COCK. LPPLI CATION FILED APR. 17, 1907.

a annrs-snnnr 2.

' 7 e1 (Sun/3607:

' JZZOIVZ AXEL SUNDBORG, OF ST. PAUL, MINNESOTA.

- CYLINDER-COCK.

Specification of Letters Patent.

Patented Feb. 1 1, 1908.

Application filed April 17, 1907- Serial No. 368.782-

To all whom it may concern:

Be it known that I, AXEL SUNDBonG, a sub ect of the Kingdom of Sweden,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented a new and useful Improvement in- Cylinder-Cocks, of whichthe following is a specification.

My invention relates to improvements in cylinder cocks and moreparticularly is adapted foruse on locomotives for draining the cylindersthereof from the cab.

Heretofore mechanism for accomplishing these results has beencomplicated and the parts liable to disorder. By the use of my improvedmechanism these objections are overcome and the construction issimplified and the parts .are made effective and more positive inaction.

, In the accompanying drawings, forming part of this specification,Figure l. is a side view of a portion of a locomotive showing myinvention applied thereto; Fig. 2 is an end view of Fig. 1; Fig. 3 is adetail plan view of the front portion of the locomotive; Fig. 4

is a side view of one of the cylinder cocks; Fig. -5 1s a plan view ofFig. 4 Flg. 6 1s a central longitudinal section of Fig. 41- Fig. 7 is aside view of the piston in the cylinder cock; Fig. 8 is a plan view ofFig. 7 Fig. 9 is a detail view of the upper portion of the valve in thecylinder cock; Fig. 10 is a view of the upper end of the valve shown inFig. 9; Fig. 11 is a view looking up upon the lower end of the portionof the valve shown in Fig. 9 Fig. 12

.is a side view of the lower portion of the stem of the valve shown inFig. 9, and Fig. 13 is a I view looking up at the lower end of the stem.

In the accompanying drawings A represents an ordinary locomotive, B itscab and CC the cylinders. Each cylinder is provided with a pair ofcylinder cocks D which are all of similar construction, one beingconnected with each end at the lower portion thereof for the purpose ofdraining condensation from each side of the piston in the cylinder.

The cylinder cock used in my invention includes a suitable casing 2which is formed with a longitudinal drain port passageway 3 passingtherethrough and a tapering narrow end 4 which is threaded into thecylinder wall. The threaded end of the casing is formed with a seat 5for a drain valve 6 which is normally opened by means of an expansionhelical spring 7. This valve is provided with a stem 8, the sides ofwhich shape and construction permits steam to passfreely through saidpassageway. The edges of the end of the stem adjoining the valve aregrooved at 11 so as to hold one 'end'of the helical spring,the other endof said spring impinging against the circular shoulder 12 in the casing.

The drain valve 6 is closed upon its seat by the force of steam in thecylinder and is opened when desired by means of an air operated. piston13 which has a large working area as compared with the valve and worksvertically in an air cylinder 14 on the enlarged end 15 of the casing 2.The air cylinder below the piston 13 is closed'by a threaded. plug 16which limits the downward movementof said piston. Thepiston 13 isprovided on its back with atube 17 playing freely through the plug 16and the port formed by the passageway 3 and the tube 17 forms an outletfrom the drain valve for condensation in the end of the cylinder'withwhich the drain cock is connected. The upper side of the piston 13 has ahollow. cylindrical extension 18 which plays in a cylindrical seat 19for the-purpose of forming a water-tight lapjoint between the drainvalve and air cylinder. Any water or steam leaking from the valve 6 intothe air cylinder 14 has egress from the casing 2 through the ventopenings 20. The end of the air cylinder back of the piston has an airsupply passageway 21 leading through the plug by which air under"pressure is admitted for depressing the piston and opening the valve 6,it being understood that the free end of the stem 8 impinges against thefront of said piston when said valve is closed.

' The. back of the piston is dished at 24 so that air entering the aircylinder impinges against the entire piston when down. An opening 22entering the cylinder through the plug 16 drains any water from the backof the piston, its passageway being normally closed by a thumb screw 23when the cylinder cock is in use. This construction of two part drainvalve and air piston permits the drain valve to act independently of theair piston and provides means which is operated by air pressure from thecab for positively opening and holding open the drain valve.

In use, a cylinder cock is connected in the wall at or near each end ofthe lower portion of each cylinder by the threaded end 4. To open thedrain valve 6 all of the cylinder cocks are connected by means of thepiping with a three-way valve 26 in the cab B. This automatic valve isconnected with the master or engineers valve 28 and by the train piping27 with the air supply tank 29. A drain pipe 30 is also connected withthe three -way valve which relieves pressure from the cylinder cockswhen the master valve is closed. By opening the master valve air isadmitted under pressure to the cylinder cocks against the backs of theair pistons therein which open and hold open the drain valves againstpressure that may be in the cylinders. Any condensation in the cylindersis then free to egress through the cylinder cocks. This mechanismprovides an efficient and effective means for draining the cylinderswhen the locomotive is at rest or in motion and the cooks are simple andunlikely to get out of order by water freezing in their ports.

In accordance with the patent statutes, I have described the principleof operation of my invention, together with the apparatus whichI nowconsider to represent the best embodiment thereof, but I desire to haveit understood that the apparatus shown is only illustrative and that theinvention can be carried out by other means and applied to uses otherthan those above set forth within the scope of the following claims.

Having described my invention, what I claim as new and desire to protectby Letters Patent, is

1. In combination witha locomotive having cylinders and a cab, a draincock in the lower portion of each end of each cylinder, a source of airpressure, a system of piping leading from said source of air pressureand through said cab and a master valve conemcee tained in said pi ingand located near said cab; each of sai draln cocks comprising a suitablecasing, a drain valve seated in sa1d casing, an air cylinder below saiddrain valve, an air piston freely 'dis osed in said cylinder andadjacent to the ower end of said stem and adapted when in superiorposition to hold said drain valve open, a lap joint between said drainvalve and air cylinder, and a drain port passageway passing through saidcasing and piston,

2. In combination with a locomotive and its cylinder, a drain cock inthe lower portion of each end of said cylinder, a source of airpressure, a system of piping connected with said source of air pressure,and a master valve contained in said piping, said drain cock comprisinga suitable casing, a drain valve seated in said casing, an air cylinderbelow said drain valve, an air piston in said cylinder and adjacent tothe lower end of said stem and adapted when in superior position to holdsaid drain valve open, a lap joint between said drain valve and aircylinder, and a drain port passageway passing through said casing andpiston.

3. A drain cock comprising a suitable casing, a drain valve seated insaid casing, an air cylinder below said drain valve, an air pistonfreely disposed in said cylinder and adjacent to the lower end of saidstem, a lap jointbetween said drain valve and air cylinder, and a drainport passageway passing through said casing and piston.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

AXEL SUNDBORG.

Witnesses:

H. L. FISCHER, F. G. BRADBURY.

